Monographs Details: Mimosa barnebiana Fortunato & Tressens
Authors:Rupert C. Barneby
Authority: Barneby, Rupert C. 1991. Sensitivae Censitae. A description of the genus Mimosa Linnaeus (Mimosaceae) in the New World. Mem. New York Bot. Gard. 65: 1-835.
Description:Species Description - Shrubs 2-3 m, armed on lf-stks with scattered, subacroscopic aculei 2-5(-8) mm, the young branchlets and foliage densely glandular-setulose, the fls loosely subracemose on short axillary peduncles. Stipules ovate 1.5-2.5 mm. Leaf formula ±iv-vi/20-32, the lf-stks to 7.5 cm, the rachis of distal pinnae to 3.5 cm, the paraphyllidia ovate ±0.5 x 0.5 mm, the lfts either alternate or subopposite along rachis, narrowly oblong obtuse ±3-5(-5.5) mm. Peduncle and spike-axis together 5-8 cm; pedicels to 0.3 mm; flowers 4-merous 8-androus, glabrous or almost so, the lower ones staminate, the campanulate calyx 0.5 mm, the turbinate corolla ±2.2 mm, its broadly ovate lobes nearly half as long; fertilized ovary densely glandular-setulose. Craspedium 20-40 x 3-5 mm, the replum 0.5 mm wide, the valves glabrous, glandular, the 3-7(-8) almost square articles 4-6 mm long.
Distribution and Ecology - In flooded campo of islands in the Paraná river on both sides of the Paraguay-Argentina boundary downstream from Posadas, between 56° and 57°W.-F1. X-I.
Mimosa barnebiana presents the unforeseen combination of indumentum and dilated paraphyllidia proper to ser. Stipellares with loose amentiform units of inflorescence unique in the series. A parallel development is M. chacoensis in sect. Habbasia ser. Rojasianae.
Distribution:Paraguay South America
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